(Color online) Thresholding functions corresponding to different risk functions: (a) MPE, SURE, expected ℓ₁ distortion; (b) MPE for various values of ∈; and (c) MPE, MSE. In (a) and (b), the noise considered is Gaussian. In (c), both Laplacian and Gaussian noise types have been considered with σ = 1 and ϵ = 3σ.